WO2005106542A1 - Film optique et colorant pour dispositif d'affichage a ecran plat - Google Patents

Film optique et colorant pour dispositif d'affichage a ecran plat Download PDF

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Publication number
WO2005106542A1
WO2005106542A1 PCT/KR2005/001252 KR2005001252W WO2005106542A1 WO 2005106542 A1 WO2005106542 A1 WO 2005106542A1 KR 2005001252 W KR2005001252 W KR 2005001252W WO 2005106542 A1 WO2005106542 A1 WO 2005106542A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
dye
optical film
optical
direct dye
Prior art date
Application number
PCT/KR2005/001252
Other languages
English (en)
Inventor
Hee-Won Lee
Won-Keun Yoon
Sang-Kug Lee
Original Assignee
Ace Digitech, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020040030459A external-priority patent/KR100671401B1/ko
Priority claimed from KR1020050035488A external-priority patent/KR100671406B1/ko
Application filed by Ace Digitech, Ltd. filed Critical Ace Digitech, Ltd.
Publication of WO2005106542A1 publication Critical patent/WO2005106542A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B33/00—Disazo and polyazo dyes of the types A->K<-B, A->B->K<-C, or the like, prepared by diazotising and coupling
    • C09B33/02—Disazo dyes
    • C09B33/08—Disazo dyes in which the coupling component is a hydroxy-amino compound
    • C09B33/10—Disazo dyes in which the coupling component is a hydroxy-amino compound in which the coupling component is an amino naphthol
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B43/00—Preparation of azo dyes from other azo compounds
    • C09B43/12—Preparation of azo dyes from other azo compounds by acylation of amino groups
    • C09B43/136—Preparation of azo dyes from other azo compounds by acylation of amino groups with polyfunctional acylating agents
    • C09B43/14—Preparation of azo dyes from other azo compounds by acylation of amino groups with polyfunctional acylating agents with phosgene or thiophosgene
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133533—Colour selective polarisers

Definitions

  • the present invention relates to a dye and an optical film for a flat
  • the dye being a direct dye having absorption
  • the optical film absorbing orange light in the
  • LCD liquid crystal display
  • OLED electroluminescence display
  • PDP plasma display panel
  • the PDP has a problem of generating a red color due
  • the device can be improved by using a squarylium compound as the pigment.
  • anti-reflection filter is placed in front of the flat panel display device to
  • ND neutral density
  • FIG. 1 is a cross-sectional view of the optical film according to an
  • FIG. 2 is a cross-sectional view of the optical film according to
  • FIG. 3 is a cross-sectional view of the optical film according to still
  • FIG. 4 is a schematic view of a conventional plasma display device.
  • FIG. 5 shows parallel and orthogonal transmission spectra of two sheets of optical films prepared by using SOLOPHENYL BORDEAUX 3BLE
  • FIG. 6 shows the transmission spectrum of the single optical film
  • FIG. 7 shows the transmission spectrum of the optical film prepared
  • FIG. 8 shows the transmission spectrum of the optical film prepared
  • FIG. 9 shows the transmission spectrum of the optical film
  • FIG. 10 shows the transmission spectrum of the optical film
  • FIG. 11 shows the transmission spectrum of the optical film prepared by using iodine as a dichromatic dye and the squarylium pigment
  • Direct dye refers to a dye which is compatible with such celluosic
  • fibers as cotton and rayon, so that it is directly dyed in neutral or weak alkaline water-solutions without pretreatments such as mordancy or primary immersing.
  • the present invention improves color purity of a flat panel display device by using an optical film or filter comprising the direct dye. There has been no attempt of employing the direct dye in an optical film of a flat panel display device as yet.
  • the direct dye can be used any dye which can absorb light of wavelength ranging from 550 to ⁇ OOnm, which is not limited to.
  • Suitable direct dyes are at least one dye compound selected from the group consisting of benzadine direct dye; azo direct dye selected from the group consisting of diaryl amine derivatives tyepe azo dye, cyanur ring type azo dye, stilbene type azo dye and thiazole type azo dye; dioxazine direct dye and phthalocyanine direct dye.
  • the azo direct dye may be a compound represented by Chemical Formula 1 below:
  • Ri is selected from the group consisting of and
  • each of R 2 , R 3 , and R 4 is an identical or different functional group selected from the group consisting of hydrogen, hydroxy ,
  • the azo direct dye can be used the follwing
  • the above-mentioned direct dye can be employed in an optical film
  • the optical film can absorb light having
  • wavelength raging from 550 to 660, corresponding to neon light (orange
  • the direct dye on the optical film prevents from reducing luminance of un-illuminated pixels, it leads to increase the color purity of the
  • the direct dye used in the present invention has
  • the optical film comprising the direct dye has dichroism as well. Therefore, the optical film comprising the direct dye of the present
  • optical properties such as absorption of specific wavelength and dichroism
  • invention comprises a base film and a direct dye, which it molecular is
  • the base film offers polarizing ability to the optical film (polarizer)
  • Suitable transparent polymer are one
  • polyvinyls including
  • polyesters including
  • polycarbonate polyethyleneterephthalate and polybutyleneterephthalate
  • polyolefins including polyethylene and polypropylene
  • polycarboxylayes including poly acrylic acid, poly methacrylic acid and
  • polycrotonic acid polyacrylamides
  • the optical film of the present invention offers such a dichroic dye as iodine
  • present invention can be utilized in many ways, such as laminated with a
  • FIG. 1 shows a cross-sectional view of the optical film according to
  • the adhesive layer is
  • embodiment of the invention comprises the first optical film 10 having a
  • the transparent protecting films 12 may be prepared or purchased. Preferably, at least one selected from the group consisting of triacetate
  • TAC cellulose
  • CAB cellulose acetate butylene
  • polyvinylchloride polystyrene, polyacrylate, polymethacrylate,
  • polymethylacrylate polymethylmethacrylate
  • polyethylene polyethylene
  • polypropylene polypropylene
  • polyethylene terephthalate may be used.
  • polyethylene terephthalate may be used.
  • cellulose is more preferred from the aspect of birefringence property
  • the transparent protecting films 12 can be used without any
  • EMI electromagnetic
  • the transparent protecting films 12 and the first optical film 10 are identical to The transparent protecting films 12 and the first optical film 10.
  • the adhesive is not
  • polyvinylalcohol polyacrylate, polymethacrylate, polymethylacrylate,
  • polymethylmethacrylate a silicone polymer, polyester, polyurethane,
  • polyamide, polyether, and fluorine or rubber polymer can be used.
  • polyvinylalcohol is more preferred from the aspect of optical
  • the optical film 1a of the second embodiment plays a role similar to
  • FIG. 2 is a schematic diagram of the optical film 1 b according to the
  • the adhesive layer is not
  • the optical film 1 b according to the third embodiment of the present invention comprises a first optical film 10 having
  • a base film comprising a direct dye, transparent protecting films 12
  • phase contrast films 14 laminated on one side of the transparent protecting films 12.
  • the phase contrast films 14 offer a phase difference of about 1/4 ⁇
  • any films used in the present invention, any films
  • the examples include a homopolymer, a copolymer, or a blend polymer
  • polymer is selected from the group consisting of polycarbonate, polyethylene, polypropylene, polynorbornene,
  • polyvinylchloride polystyrene, polyacrylonitrile, polyester, polysulfone,
  • polyallylate polyvinylalcohol, polymethacrylate ester, polyacrylate ester,
  • phase contrast films 14 are laminated with the transparent electrode
  • the optical film 1 b of the third embodiment is characterized by
  • optical film 1 b is characterized by further enhancing
  • FIG. 3 is a schematic diagram of the optical film 1 c according to the
  • the adhesive layer is not
  • embodiment of the present invention comprises a first optical film 10 having
  • a base film comprising a direct dye, transparent protecting films 12
  • phase contrast films 14 may be
  • the functional film 16 may be a hard coat film, a surface anti-
  • An adhesive layer or film is used to insert into
  • the hard coat film is formed to protect the surface of the optical film
  • UV-setting resin as acryl and silicone resins having superior hardness and slide characteristics.
  • the surface anti-reflection film is used for anti-reflection of external
  • the anti-glare film is used to prevent a decrease in visibility of light
  • the anti-refection effect can be obtained by forming irregular and
  • the EMI shielding film can be used a mesh type or transparent
  • metal film type which is a conductive film.
  • the view angle compensating film is used to widen view angle, so
  • a triacetyl cellulose film comprising discotic liquid crystal or a phase contrast film.
  • the brightness enhancement film is used to intensify light
  • cholesteric liquid crystal polymers are aligned, or a base film supported by
  • the optical film of the present invention further comprises an
  • Adhesive can be any suitable adhesive layer or film between each functional film or layer.
  • Adhesive can be any suitable adhesive layer or film between each functional film or layer.
  • polymer a silicone polymer, polyester, polyurethane, polyether, or
  • acryl resin is more preferred from the
  • each functional film 14 laminates on one or
  • reflection film/hard coat film/EMI shielding film/transparent protecting film/base film comprising a direct dye/transparent protecting film/adhesive
  • film/base film comprising a direct dye/transparent protecting film/adhesive
  • film/base film comprising a direct dye /transparent protecting film/adhesive
  • protecting film/base film comprising a direct dye/transparent protecting
  • optical film comprising a direct dye of the present invention
  • a base film is prepared by the conventional method without any limitation.
  • a first step it is performed by soaking a base film into a water
  • the temperature is a factor such as a material or amount of the base film
  • the film is swollen excessively, part of the base film is dissolved by water,
  • the direct dye is used an
  • the content of the direct dye depends on the temperature of sink having the
  • the stretching process carries
  • stretching method can be applied any conventional method used in this art.
  • optical films on both sides of the polarizer to prepare an optical film.
  • film of the present invention has a thickness of 15 to 40 ⁇ m, which can be
  • the optical film has a
  • optical film of the present invention offers polarizing ability and color compensation effect without an additional color compensation dyes due to
  • optical film of the present invention has a superior optical film
  • the optical film may have further improved contrast by using or not using an internal anti-reflection layer or internal anti-reflection film because
  • the optical film of the present invention can be preferably used for producing a flat panel display such as liquid crystal display devices (LCDs),
  • PDPs plasma display devices
  • organic electroluminescent display devices organic electroluminescent display devices
  • OLEDs organic light-emitting diode-ray tubes
  • CRTs cathode-ray tubes
  • FIG. 4 is a schematic view of a conventional plasma display device.
  • the optical film of the present invention is employed in such a
  • a plasma display device 200 generally includes
  • panel part comprising a back panel 220 coated with phosphors
  • optical filter 260 positioned in front of the front panel 240, and a driving part
  • the optical filter 260 is installed to offer high quality images. All or
  • part of the optical filter 260 may be the optical film in which the direct dye of
  • the present invention is uptaken, and may be equipped with a phase
  • the PDP employing the optical filter equipped with the optical film
  • Roll-type polyvinylalcohol having a DP of 1 ,700, a thickness of 70
  • the PVA film was passed through a water bath of 25 °C at a speed
  • obtained first optical film has a thickness of 2.3 ⁇ m, a width of 5.4 m, and a
  • TAC triacetate cellulose
  • optical film it carried out laminating 1/4 ⁇ -phase contrast film on the acryl
  • the first and second optical films and an optical filter were prepared
  • the first and second optical films and an optical filter were prepared
  • Example 4 The first and second optical films and an optical filter were prepared
  • Example 5 The first and second optical films and an optical filter were prepared
  • a polarizer was prepared by laminating a base film dispersed iodine dichromic dye with transparent films sputtered squarylium pigment.
  • crossed transmittances were measured at 25 °C using a spectrophotometer
  • Equation 1 Polarizing efficiency — where, A is parallel-transmittance when the axes of the two sheets of the
  • optical films are parallel with each other.
  • FIG. 5 and FIG. 6 show transmission spectra of the optical film
  • FIG. 6 is a transmission spectrum of a single optical film.
  • FIG. 7 is a transmission spectrum of the optical film prepared in
  • the optical film of Example 2 has an absorption
  • the optical wavelength ranging from 470 to 610 nm broadly.
  • the optical wavelength ranging from 470 to 610 nm broadly.
  • FIG. 8 is a transmission spectrum of the optical film prepared in
  • the optical film of Example 3 shows absorption
  • FIG. 9 is a transmission spectrum of the optical film prepared
  • Example 4 in which SIRIUS RED VIOLET RL was used as a direct dye.
  • the optical film of Example 4 shows absorption •
  • FIG. 10 is a transmission spectrum of the optical film prepared in Example 5, in which SIRIUS RUBINE K-2BL was used as a direct dye.
  • the optical film of Example 5 shows absorption
  • FIG. 11 is a transmission spectrum of the optical film prepared in
  • dichroic dye used as a dichroic dye and a color compensation dye, respectively.
  • film of the present invention absorbs effectively neon light (orange light)
  • a positive (+) and negative (-) mean a red color and green color
  • the polarizer and the optical film of the present invention in which only a direct dye was used, improve color purity by effectively
  • Equation 2 One with no optical filter was used as a blank, and a
  • Examples 1 to 5 have reflectance smaller than 15.4 %
  • optical filters of the present invention were identical to each other and thus they can effectively control internal reflection.
  • the optical filters of the present invention were identical to each other and thus they can effectively control internal reflection.
  • the optical filters of the present invention were identical to each other and thus they can effectively control internal reflection.
  • the optical filters of the present invention were identical to each other and thus they can effectively control internal reflection.
  • the optical filters of the present invention were identical to each other and thus they can effectively control internal reflection.
  • the present invention offers good color purity

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Filters (AREA)
  • Polarising Elements (AREA)

Abstract

La présente invention concerne un film optique comprenant un colorant direct présentant une longueur d'onde d'absorption comprise entre 550 et 600nm. Le film optique est conçu pour améliorer la pureté des couleurs par blocage efficace de la lumière néon qui est générée pendant le fonctionnement d'un dispositif à écran plat; et pour améliorer le contraste par réduction de la réflexion interne sans couche de compensation de couleur ni film de compensation de couleur supplémentaire. Le film optique décrit dans cette invention peut s'appliquer à une large gamme de dispositifs d'affichage à écran plat, en particulier, en tant que filtre optique pour un écran plasma.
PCT/KR2005/001252 2004-04-30 2005-04-29 Film optique et colorant pour dispositif d'affichage a ecran plat WO2005106542A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
KR10-2004-0030460 2004-04-30
KR1020040030459A KR100671401B1 (ko) 2004-04-30 2004-04-30 표시 장치용 염료
KR10-2004-0030459 2004-04-30
KR20040030461 2004-04-30
KR10-2004-0030461 2004-04-30
KR20040030460 2004-04-30
KR1020050035488A KR100671406B1 (ko) 2004-04-30 2005-04-28 평판표시장치용 광학필름 및 광학필터
KR10-2005-0035488 2005-04-28

Publications (1)

Publication Number Publication Date
WO2005106542A1 true WO2005106542A1 (fr) 2005-11-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2005/001252 WO2005106542A1 (fr) 2004-04-30 2005-04-29 Film optique et colorant pour dispositif d'affichage a ecran plat

Country Status (1)

Country Link
WO (1) WO2005106542A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008002037A1 (fr) * 2006-06-27 2008-01-03 Kolon Industries, Inc. Colorants dichroïques réactifs, procédé de préparation de ces derniers, film à base de poly(alcool de vinyle) comprenant des colorants dichroïques réactifs et film polarisant
WO2009002051A2 (fr) * 2007-06-22 2008-12-31 Kolon Industries, Inc. Colorants dichroïques réactifs, procédé de préparation de ces derniers, film à base de poly(alcool de vinyle) comprenant les colorants dichroïques réactifs et film polarisant
KR100993896B1 (ko) 2006-12-15 2010-11-11 코오롱인더스트리 주식회사 반응성 이색성 염료를 포함하는 폴리비닐알코올계 필름 및편광필름
KR100995610B1 (ko) 2007-06-22 2010-11-22 금오공과대학교 산학협력단 반응성 이색성 염료, 그 제조방법, 반응성 이색성 염료를포함하는 폴리비닐알코올계 필름 및 편광필름
KR100995613B1 (ko) 2006-06-27 2010-11-22 금오공과대학교 산학협력단 반응성 이색성 염료 및 그 제조방법
EP2113807A3 (fr) * 2008-04-30 2011-08-31 FUJIFILM Corporation Matériau optique disposant d'une couche anisotrope colorée optiquement
WO2015179761A1 (fr) * 2014-05-23 2015-11-26 Digihealth LLC Film de réduction d'émission de lumière pour dispositifs électroniques
US10495795B2 (en) 2014-05-23 2019-12-03 Eyesafe, Llc Light emission reducing compounds for electronic devices
US10642087B2 (en) 2014-05-23 2020-05-05 Eyesafe, Llc Light emission reducing compounds for electronic devices
US10955697B2 (en) 2018-11-28 2021-03-23 Eyesafe Inc. Light emission modification
US10971660B2 (en) 2019-08-09 2021-04-06 Eyesafe Inc. White LED light source and method of making same
US11126033B2 (en) 2018-11-28 2021-09-21 Eyesafe Inc. Backlight unit with emission modification
US11592701B2 (en) 2018-11-28 2023-02-28 Eyesafe Inc. Backlight unit with emission modification
US11810532B2 (en) 2018-11-28 2023-11-07 Eyesafe Inc. Systems for monitoring and regulating harmful blue light exposure from digital devices

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970042998A (ko) * 1995-12-29 1997-07-26 성재갑 무색 투명한 액체 세정제 조성물
JP2000258625A (ja) * 1999-03-05 2000-09-22 Hitachi Ltd 表示装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970042998A (ko) * 1995-12-29 1997-07-26 성재갑 무색 투명한 액체 세정제 조성물
JP2000258625A (ja) * 1999-03-05 2000-09-22 Hitachi Ltd 表示装置

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008002037A1 (fr) * 2006-06-27 2008-01-03 Kolon Industries, Inc. Colorants dichroïques réactifs, procédé de préparation de ces derniers, film à base de poly(alcool de vinyle) comprenant des colorants dichroïques réactifs et film polarisant
KR100995613B1 (ko) 2006-06-27 2010-11-22 금오공과대학교 산학협력단 반응성 이색성 염료 및 그 제조방법
KR100993896B1 (ko) 2006-12-15 2010-11-11 코오롱인더스트리 주식회사 반응성 이색성 염료를 포함하는 폴리비닐알코올계 필름 및편광필름
WO2009002051A2 (fr) * 2007-06-22 2008-12-31 Kolon Industries, Inc. Colorants dichroïques réactifs, procédé de préparation de ces derniers, film à base de poly(alcool de vinyle) comprenant les colorants dichroïques réactifs et film polarisant
WO2009002051A3 (fr) * 2007-06-22 2009-02-19 Kolon Inc Colorants dichroïques réactifs, procédé de préparation de ces derniers, film à base de poly(alcool de vinyle) comprenant les colorants dichroïques réactifs et film polarisant
KR100995610B1 (ko) 2007-06-22 2010-11-22 금오공과대학교 산학협력단 반응성 이색성 염료, 그 제조방법, 반응성 이색성 염료를포함하는 폴리비닐알코올계 필름 및 편광필름
EP2113807A3 (fr) * 2008-04-30 2011-08-31 FUJIFILM Corporation Matériau optique disposant d'une couche anisotrope colorée optiquement
US10871671B2 (en) 2014-05-23 2020-12-22 Eyesafe, Llc Light emission reducing compounds for electronic devices
US10495795B2 (en) 2014-05-23 2019-12-03 Eyesafe, Llc Light emission reducing compounds for electronic devices
US10642087B2 (en) 2014-05-23 2020-05-05 Eyesafe, Llc Light emission reducing compounds for electronic devices
WO2015179761A1 (fr) * 2014-05-23 2015-11-26 Digihealth LLC Film de réduction d'émission de lumière pour dispositifs électroniques
US10901125B2 (en) 2014-05-23 2021-01-26 Eyesafe, Llc Light emission reducing compounds for electronic devices
US11947209B2 (en) 2014-05-23 2024-04-02 Eyesafe Inc. Light emission reducing compounds for electronic devices
US11686968B2 (en) 2014-05-23 2023-06-27 Eyesafe Inc. Light emission reducing compounds for electronic devices
US11592701B2 (en) 2018-11-28 2023-02-28 Eyesafe Inc. Backlight unit with emission modification
US11126033B2 (en) 2018-11-28 2021-09-21 Eyesafe Inc. Backlight unit with emission modification
US11347099B2 (en) 2018-11-28 2022-05-31 Eyesafe Inc. Light management filter and related software
US11810532B2 (en) 2018-11-28 2023-11-07 Eyesafe Inc. Systems for monitoring and regulating harmful blue light exposure from digital devices
US10955697B2 (en) 2018-11-28 2021-03-23 Eyesafe Inc. Light emission modification
US10998471B2 (en) 2019-08-09 2021-05-04 Eyesafe Inc. White LED light source and method of making same
US10971660B2 (en) 2019-08-09 2021-04-06 Eyesafe Inc. White LED light source and method of making same

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